US3901272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unidirectional flow control valve
Assignee: Ford Motor Co
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Filing: 1974-01-04
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Granted: 1975-08-26
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Expires: 1994-01-04
Abstract
Abstract A unidirectional controlled flow valve has a flexible duckbilllike portion with a slit through which a wire projects to define small controlled flow areas between the wire and slit when the duckbill-like portion is closed by higher pressure forces external of the portion than internal, and free flow in the opposite direction through the open slit when the pressure conditions are reversed.
Inventors
- 👤 Delbert J Banners
- 👤 Calvin J Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:07
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/7848; Y10T137/7879; Y10T137/788; Y10T137/7882
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |